A255354 - cp's OEIS frontend

A255354 a(n) = smallest number k such that (k + n)' = k', or -1 if no such number exists, where k' is the arithmetic derivative of k.

n	a(n)
1	2
2	3
3	2
4	3
5	2
6	5
7	110
8	3
9	2
10	3
11	2
12	5
13	50145
14	3
15	2
16	3
17	2
18	5
19	53115
20	3
21	2
22	7
23	189
24	5
25	273
26	3
27	2
28	3
29	2
30	7
31	75
32	5
33	930642191642
34	3
35	2
36	5
37	165
38	3
39	2
40	3
41	2
42	5
43	12
44	3
45	2
46	7
47	99
48	5
49	182
50	3
51	2
52	7
53	706
54	5
55	1523965807
56	3
57	2
58	3
59	2
60	7
61	494
62	5

[2, 3, 2, 3, 2, 5, 110, 3, 2, 3, 2, 5, 50145, 3, 2, 3, 2, 5, 53115, 3, 2, 7, 189, 5, 273, 3, 2, 3, 2, 7, 75, 5, 930642191642, 3, 2, 5, 165, 3, 2, 3, 2, 5, 12, 3, 2, 7, 99, 5, 182, 3, 2, 7, 706, 5, 1523965807, 3, 2, 3, 2, 7, 494, 5]

cp's OEIS Frontend

A255354 a(n) = smallest number k such that (k + n)' = k', or -1 if no such number exists, where k' is the arithmetic derivative of k.

Table of values

List of values